x=list(map(float,input().split()))
x1,y1,x2,y2=x[0],x[1],x[2],x[3]
print(((x1-x2)**2 + (y1-y2)**2)**0.5) x=list(map(float,input().split())) x list(map(float,input().split())) list map(float,input().split()) map float input().split() ().split () input split x1,y1,x2,y2=x[0],x[1],x[2],x[3] x1 x[0] x 0 y1 x[1] x 1 x2 x[2] x 2 y2 x[3] x 3 print(((x1-x2)**2 + (y1-y2)**2)**0.5) print ((x1-x2)**2 + (y1-y2)**2)**0.5 (x1-x2)**2 + (y1-y2)**2 (x1-x2)**2 x1-x2 x1 x2 2 (y1-y2)**2 y1-y2 y1 y2 2 0.5 x=list(map(float,input().split())) list(map(float,input().split())) x x2,y2=x[0],x[1],x[2],x[3] x[2] x2 x1,y1,x2,y2=x[0],x[1],x[2],x[3] x[0] x1 y2=x[0],x[1],x[2],x[3] x[3] y2 y1,x2,y2=x[0],x[1],x[2],x[3] x[1] y1
x=list(map(float,input().split()))
x1,y1,x2,y2=x[0],x[1],x[2],x[3]
print(((x1-x2)**2 + (y1-y2)**2)**0.5)